#!/usr/bin/env python3
"""
Generate URLs and file hashes to be included in the Homebrew formula
after a new release of HTTPie has been published on PyPi.

https://github.com/Homebrew/homebrew-core/blob/master/Formula/httpie.rb

"""
import hashlib
import requests


PACKAGES = [
    'httpie',
    'pygments',
    'requests',
    'certifi',
    'urllib3',
    'idna',
    'chardet',
    'PySocks',
]


def get_package_meta(package_name):
    api_url = 'https://pypi.python.org/pypi/{}/json'.format(package_name)
    resp = requests.get(api_url).json()
    hasher = hashlib.sha256()
    for release in resp['urls']:
        download_url = release['url']
        if download_url.endswith('.tar.gz'):
            hasher.update(requests.get(download_url).content)
            return {
                'name': package_name,
                'url': download_url,
                'sha256': hasher.hexdigest(),
            }
    else:
        raise RuntimeError(
            '{}: download not found: {}'.format(package_name, resp))


def main():
    package_meta_map = {
        package_name: get_package_meta(package_name)
        for package_name in PACKAGES
    }
    httpie_meta = package_meta_map.pop('httpie')
    print()
    print('  url "{url}"'.format(url=httpie_meta['url']))
    print('  sha256 "{sha256}"'.format(sha256=httpie_meta['sha256']))
    print()
    for dep_meta in package_meta_map.values():
        print('  resource "{name}" do'.format(name=dep_meta['name']))
        print('    url "{url}"'.format(url=dep_meta['url']))
        print('    sha256 "{sha256}"'.format(sha256=dep_meta['sha256']))
        print('  end')
        print('')


if __name__ == '__main__':
    main()